Freestanding headers

kernel/std/include/stdarg.h

@@ -0,0 +1,35 @@
+/* Copyright (C) 2022-2025 Mintsuki and contributors.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef __FREESTND_C_HDRS_STDARG_H
+#define __FREESTND_C_HDRS_STDARG_H 1
+
+typedef __builtin_va_list va_list;
+
+#undef va_start
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ > 201710L
+#  define va_start(v, ...) __builtin_va_start(v, 0)
+#else
+#  define va_start(v, l) __builtin_va_start(v, l)
+#endif
+#undef va_end
+#define va_end(v) __builtin_va_end(v)
+#undef va_arg
+#define va_arg(v, l) __builtin_va_arg(v, l)
+#if (defined(__cplusplus) && (__cplusplus >= 201103L)) || (defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L))
+#  undef va_copy
+#  define va_copy(d, s) __builtin_va_copy(d, s)
+#endif
+
+#endif